(c) An allegedly unauthorized carrier may challenge a subscriber's allegation that an unauthorized change, as defined by § 64.1100(e), occurred. An allegedly unauthorized carrier choosing to challenge such allegation shall immediately notify the complaining subscriber that: The complaining subscriber must file a complaint with a State commission that has opted to administer the FCC's rules, pursuant to § 64.1110, or the FCC within 30 days of either the date of removal of charges from the complaining subscriber's bill in accordance with paragraph (b) of this section, or the date the allegedly unauthorized carrier notifies the complaining subscriber of the requirements of this paragraph, whichever is later; and a failure to file such a complaint within this 30-day time period will result in the charges removed pursuant to paragraph (b) of this section being reinstated on the subscriber's bill and, consequently, the complaining subscriber will only be entitled to remedies for the alleged unauthorized change other than those provided for in § 64.1140(b)(1). No allegedly unauthorized carrier shall reinstate charges to a subscriber's bill pursuant to the provisions of this paragraph without first providing such subscriber with a reasonable opportunity to demonstrate that the requisite complaint was timely filed within the 30-day period described in this paragraph.

(g) When a LEC has assigned a subscriber to a carrier without authorization, and where the subscriber has not paid the unauthorized charges, the LEC shall switch the subscriber to the desired carrier at no cost to the subscriber, and shall also secure the removal of the unauthorized charges from the subscriber's bill in accordance with the procedures specified in paragraphs (a) through (f) of this section.